Information of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands		Jun. 30, 2018		Dec. 31, 2017
Assets:
Derivative assets				$ 11
Total assets				11
Liabilities:
Junior subordinated notes, at fair value		$ 5,111		8,121
Total liabilities		5,111		8,121
Significant Other Observable Inputs (Level 2)
Assets:
Derivative assets	[1]			11
Total assets	[1]			11
Significant Unobservable Inputs (Level 3)
Liabilities:
Junior subordinated notes, at fair value		5,111	[2]	8,121	[1]
Total liabilities		$ 5,111	[2]	$ 8,121	[1]

[1] During the year ended December 31, 2017, there were no transfers between Level 1 and Level 2, and there were no transfers into and/or out of Level 3.

[2] During the six months ended June 30, 2018, there were no transfers between Level 1 and Level 2, and there were no transfers into and/or out of Level 3.